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Geosciences 2013, 3(1), 1-29; doi:10.3390/geosciences3010001
Article

Nacre in Molluscs from the Ordovician of the Midwestern United States

1,* , 2
, 3
 and 4
Received: 13 November 2012; in revised form: 24 December 2012 / Accepted: 31 December 2012 / Published: 8 January 2013
(This article belongs to the Special Issue Paleontology and Geo/Biological Evolution)
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Abstract: Nacre was previously thought to be primitive in the Mollusca, but no convincing Cambrian examples are known. This aragonitic microstructure with crystal tablets that grow within an organic framework is thought to be the strongest, most fracture-resistant type of shell microstructure. Fossils described herein from the Ordovician of Iowa, Indiana, and Ohio provide supporting evidence for the hypothesis that sometime between the middle Cambrian and late Ordovician, nacre originated in cephalopod, bivalve, and possibly gastropod lineages. The correlation of independent origins of fracture-resistant nacre with increasing shell-crushing abilities of predators during the Cambrian-Ordovician suggests an early pulse in the evolutionary arms race between predators and molluscan prey.
Keywords: nacre; Ordovician; Isorthoceras; cephalopod; shell microstructure; Maquoketa; Arnheim; Cyclora; Ohio; Iowa nacre; Ordovician; Isorthoceras; cephalopod; shell microstructure; Maquoketa; Arnheim; Cyclora; Ohio; Iowa
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Vendrasco, M.J.; Checa, A.; Heimbrock, W.P.; Baumann, S.D. Nacre in Molluscs from the Ordovician of the Midwestern United States. Geosciences 2013, 3, 1-29.

AMA Style

Vendrasco MJ, Checa A, Heimbrock WP, Baumann SD. Nacre in Molluscs from the Ordovician of the Midwestern United States. Geosciences. 2013; 3(1):1-29.

Chicago/Turabian Style

Vendrasco, Michael J.; Checa, Antonio; Heimbrock, William P.; Baumann, Steven D. 2013. "Nacre in Molluscs from the Ordovician of the Midwestern United States." Geosciences 3, no. 1: 1-29.

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